21762754779 has 8 divisors (see below), whose sum is σ = 29195025472. Its totient is φ = 14419493640.

The previous prime is 21762754729. The next prime is 21762754781. The reversal of 21762754779 is 97745726712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21762754779 - 2⁹ = 21762754267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21762754729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22251817 + ... + 22252794.

It is an arithmetic number, because the mean of its divisors is an integer number (3649378184).

Almost surely, 2^21762754779 is an apocalyptic number.

21762754779 is a deficient number, since it is larger than the sum of its proper divisors (7432270693).

21762754779 is a wasteful number, since it uses less digits than its factorization.

21762754779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44504777.

The product of its digits is 10372320, while the sum is 57.

The spelling of 21762754779 in words is "twenty-one billion, seven hundred sixty-two million, seven hundred fifty-four thousand, seven hundred seventy-nine".